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1 import { runInOp } from "../display/operations.js"
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2 import { ensureCursorVisible } from "../display/scrolling.js"
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3 import { cmp } from "../line/pos.js"
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4 import { replaceRange } from "../model/changes.js"
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5 import { lst } from "../util/misc.js"
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6
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7 // Helper for deleting text near the selection(s), used to implement
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8 // backspace, delete, and similar functionality.
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9 export function deleteNearSelection(cm, compute) {
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10 let ranges = cm.doc.sel.ranges, kill = []
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11 // Build up a set of ranges to kill first, merging overlapping
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12 // ranges.
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13 for (let i = 0; i < ranges.length; i++) {
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14 let toKill = compute(ranges[i])
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15 while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
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16 let replaced = kill.pop()
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17 if (cmp(replaced.from, toKill.from) < 0) {
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18 toKill.from = replaced.from
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19 break
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20 }
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21 }
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22 kill.push(toKill)
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23 }
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24 // Next, remove those actual ranges.
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25 runInOp(cm, () => {
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26 for (let i = kill.length - 1; i >= 0; i--)
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27 replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete")
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28 ensureCursorVisible(cm)
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29 })
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30 }
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